Pneumatic tire



April 1, 1924. 1,488,998

TTTTTTTTTTT RE Filed March 27 1920 2 Sheets-Sheet 1 April 1 1924. 1,488,998

C L M A R S H A LL Filed March 27 1920 eeeeeeeeeeee t 2 Patented Apr. it, 1924,

CHARLES LANCASTER MA SHAL or LONDON, ENGLAND.

PNEUMATIC TIRE.

Application filed March 27, 1920. Serial No. 369,340.

To (471 whom it may concern:.

Be it known that I, CHARLES LANCASTER MARSHALL. of 27 Queen Victoria Street, London, E. C. 4, England, have invented 6 certain new and useful Improvements in Pneumatic Tires, of which the following is aspecification.

My invention relates to improvements in pneumatic tires and their manufacture and is an improvement in or modification of-the invention described in my earlier application for Patent No. 322494 filed 8th September 1919 and relates to the manufacture of an inflated air tube in combination with gas or air impregnated spongy rubber filling for pneumatic. tires and the like, and has for its object to provide for pneumatic tires the combination of an inflated tube and a filling within the said tube of gas or air impregnated vulcanized spongy rubber under pressure.

The advantages of this combinatidn or air and vulcanized spongy rubber filling for pneumatic tires is fully described in my earlier application for patent. The further advantages of the present invention is .in providing a convenient and interchanging form of the combination in a tube suitable for use in all makes of pneumatic tires of 30 any given size. Particularly will this be found of service in pneumatic tires when used for commercial vehicles, as this form of tube is readily and easily transferable from a worn to a new tire whenever required without the aid of special tools or any expensive method of application. One of the disadvantages of gas-impregnated vulcane ized spongy rubber filling when it contains a high gas pressure'is that it is found impracticable to supply the filling in a suitable portable form to enable the ordinary motorist to effectively apply the same with-- in a pneumatic tire cover, and to transfer the fillin from one tire cover to another purpose, and if it were accomplished the pressure would not be maintained as in the transference a quantity of the gas would escape from the material thus lowering the tire cover.

without t e aid of special appliances for the requisite pressure; By the use of my imso proved form of air inflated tube and vulcanized spongy rubber filling, I provide the necessary means to'adequately control the pressure at all times within any pneumatic In order that my invention may be properly understood and readily carried into effect, 'I have hereunto appended two sheets of drawings, of Which- Figure 1 shows an ordinary inflated tube 00 B, (3' being the gas impregnated vulcanized spongy rubber filling which is joined to the .tube at AA.

6 Figure 2 shows the same tu'be B with the compression of the filling C When sub- 65 jected to the air pressure within the tube when in a tire cover.

Figure 3 shows a moulded form D of an air inflated tube B with the vulcanized spongy rubber filling C jointed to the tube at A. A. 7

Figure 4 shows the same tube applied to another form of tire-E, with the tube B inflated, with the vulcanized spongy rubber C under pressure.

Figure 5 shows an air inflated tube B, 76 with a reduced amount of vulcanized spongy rubber filling C jointed to the tube at A. A. Figure 6 shows the same tube B, with the vulcanized spongy ru'bber 'C under pres: sure and serving the urpose'of a distance piece and support to t e tire walls at A. A"

In the manufacture of the air tube described, it is preferable to use the vulcanized spongy rubber filling in an endless circular formation as in that shape it can be readily 1 used as the mould or internal form to buildthe air inflated tube upon. Although it .is not necessary to manufacture the air tube covering for same in tubular. formation, it is preferable to, have it vulcanized, endless and circular in its longitudinal direction as it can then be easily placed in 'posivtion over the endless spongy filling and cemented and vulcanized at the point A. A. as shown in the drawings to secure an air tight joint.

The air valve can be applied in the usual manner to the outside rubber covering and connected by a flexible tube which passes being otherwise free therefrom to permit the through the rubber filling to the inflated tube to be inflated and to cause the filling space of theair tube. to be put under the same pressure as the Claim. tube.

v 5 In a pneumatic tire, the combination of In testimony whereof I aflix my signature I an air inflated tube and a filling of gas in presence of two witnesses.

I impregnated vulcanized spongy rubber CHARLES LANCASTER MARSHALL.

within said tube, said filling belng united Witnesses: to the wall of said tube in a line of union JOHN LIDDLE,

10 extending completely around the tire and JOHN TRAIN LInnLE. 

